Chipper



Patented July 1, 1941 UNITED STATES lPATENT OFFICE CHIPPER Peter N. Ottersland, Watertown, N. Y.

Application July 13,1938, serial No. 219,103

- 3 Claims.

- This invention relates to chippers which are used for chipping or cutting logs into chips suitable for use in paper pulp machines.

Chippers usually consist of a. rotary disk having a series of knives or blades, the log to be chipped being fed to the rotary cutter in an inclined feed spout or chute. 1 As the knives are carried by the disk into engagement with the end of the log, the chips are cut therefrom.

In the chippers now in common use, the `knives are so spaced around the disk that only one knife or blade is performing its cutting or chipping function at any one time. Thus, there is a. con-` siderable space on the disk between the successive knives or blades.

As the knives engage and cut chips from the end f the log, they tend to draw the log downwardly in the chute and while the knife cuts the log and before the next knife comes into-action, there is a considerable pressure exerted between the end of the log'and the surface of the disk. This causes the disk to wear, forming concaved or grooved portions between the knives. When the end of the log engages or moves into and leaves these grooved or concaved surfaces, it is kicked back and thus is not properly positioned for engagement by the knives. Furthermore, there is nothing in the chipper as now manufactured to engage and steady the log between successive cuts. As the knives engage the log, the log tends to pivot about its lower edge since it usually does not entirely fill the feed spout and therefore jumps around, thus preventing effective action of the knives.

This invention has for its salient object to provide a chipper so constructed and arranged that the chipping of the log will be expedited and rendered more efficient.

Another object of the invention is to provide a chipper so constructed and arranged that the log will be held steady in the chute at all times during the chipping operation and the chipper will therefore produce chips of more uniform length than are produced in machines of the conventional type.

Another object of the invention is to provide a chipper so constructed and arranged as to eliminate or minimize wear on the chipper disk between the knives.

Another object of the invention is to more than double the capacity of a chipper of any given tion with the drawing which forms a part. of

this application, and in which Fig. 1 is a vertical elevation of a chipper disk having knives thereon constructed and mounted in accordance with the invention; and

Fig. 2 is an, irregular vertical section taken substantially on lline 2 2 of Fig. 1.

The invention briefly described consists of a chipper disk or rotary knife supporting member having knives so mounted thereon relative to the discharge end of the feed spout that one or more than one knife will be continually in engagement with the log during the chipping operation.

Further details of the invention will appear from the following description.

In the particular embodiment of the invention illustrated there is shown a rotary chipper disk Ill carried by a shaft II. An inclined feed spout I2 of the usual construction conducts thveilogs X to the cutter or chipper. An adjustable stationary cutting knife I3 is mounted on a bed I4 at the lower edge of the discharge end of the chute I2 for coaction with the cutting knives in finishing the cut in the log.

The disk IU has mounted thereon a plurality of cutting blades I5, each blade being disposed in the rear ofv a slot I6 through which the chips are discharged. l

The discharge end of the chute I2 is shown in dotted lines at 20 in Fig. 1 and it will be noted from the showing in this figure and also from the illustration' in Fig. 2, that two successive blades or knives are in engagement with the end of the log X during the chipping operation. The knives tend to pull the logs downwardly in the' chute during the operation thereof and thus two or more blades can operate simultaneously on the log.

vAttention is called to the fact that in the chipper construction illustrated the knives are inclined relative to the disk and extend at an angle to the plane of the disk and in a direction toward the discharge end of the chute. Due to this angular inclination of the knives they would tend to move longitudinally into the log being cut if they were free to move relative to -the disk. However, since the knives cannot move relative-to the disk their inclination or angle of entrance into the log causes the log to be pulled downwardly in the chute as the knife performs its cutting or chipping operation.

This simultaneous operation of more than, one knife insures a steadying action on the log at all times and prevents the log from jumping around,

thus interfering with the efdcient cutting action of the knives.

Although in the embodiment of the invention shown, two knives are illustrated as overlapping the discharge end of the feed spout or `chute I2, it will be understood that this number may be increased and that three or more knives can be so positioned relative to the discharge end of the spout as to come into action simultaneously on a log disposed therein.

Although one specific embodiment of the invention has been particularly shown and described, it will be understood that the invention is capable `of modification and that changes in the construction and in the arrangement of the various cooperating parts may be made without departing from the spirit or scope of the invention, as expressed in the following claims,

What I claim is:

1. I n combination, a log chipper comprising a rotatable disk, a plurality of cutting knives carried thereby and symmetrically arranged thereon, said disk having a chip discharge slot in front of each knife in the direction of rotation of the disk, an inclined chute forsupporting and feeding logs by gravity to the chipper and guiding logs to the chipper at an angle thereto, said knives being so arranged on the disk that each knife will extend across the full Width of the discharge end of the chute and cut for the full width of the log from the top to the bottom thereof and said knives being so disposed on the disk that the spacing of the knives on the disk is less than the rotary carrier having a slot therethrough in advance oi each knife through which the chips are discharged and a downwardly inclined feed ch te for supporting, guiding and conducting logs to said knives at an angle tothe rotary carrier, s id knives being. inclined away from the plane of t e rotary carrier and toward the plane of the discharge' end of the feed chute and being so arranged on the carrier relative to the discharge end of the feed chute that a plurality of knives will be in simultaneous cutting operation unha log disposed -in said chute, the inclination of the knives causing the log being operated upon to be pulled downwardly in -the chute by the cutting action of the knives thereon and the the spacing of the knives on the disk being less than the diameter of the discharge end of the chute.

diameter of the discharge end of the chute and a plurality of knives will register simultaneously with the discharge end 0f the chute and be in simultaneous cutting operation on a log, said knives being inclined away from the plane of the disk.

2. In combination, a chipper comprising a rotary carrier, a plurality of knives thereon, said Vfrom the top to the bottom thereof and said knives being so disposed on the disk that the spacing of the knives on the disk is less than the diameter of the discharge end of the chute and a plurality of knives will register simultaneously with the discharge end of the chute and be in simultaneous cutting operation on a log, said knives being inclined away from the plane of the disk, the exposed surface of the knife toward the log being iiat and inclined relative to the disk.

PETER N. OTTERSLAND. 

